Wakp stop-biotioif fob looms



J. F. DUSTIN.

WARP STOP MOTION FOR LOOMS.

APPLICATION FILED FEB. 11. ms.

Patented Aug. 8, 1916.

2 SHEETS-SHEET I.

J. FJDUSTIN.

WARP STOP MOTION FOR LOOMS.

APPLICATION FILED FEB. 17.1915.

Patented Aug. 8, 1916.

JOHN F. DUSTIN, OF LAWRENCE, MASSACHUSETTS.

WARP STOP-MOTION FOR LOOMS.

Specification of Letters Patent.

rammed Aug. 8, 1916.

Application filed February 17, 1915. Serial No. 8,794. I

bars 20 and 21 mounted side by side, the

To all whom it may concern:

Be it known that I, JOHN F. DUSTIN, a

citizen of the United States, residing at Lawrence, in the county of Essex and State of Massachusetts, have invented certain new and useful Improvements in Warp Stop- Motions for Looms; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

The present invention relates to warp stop motions for looms.

One object of the invention is to reorganize the construction of warp stop mo-' tions and to produce a warp stop motion of simplicity and consequent durability.

Another object of the invention is to produce a warp sto motion in which a fallen drop wire is uti ized to push aside the adjacent drop wiresand open up a space between them substantially the width of a fallen drop wire, thereby enabling the operator to readily ascertain where the broken war is.

To this end the invention consists of the device hereinafter described and particularly pointed out in the claims.

In the accompanying drawings illustrating the preferred embodiment of the invention, Figure 1 isan end elevation of a loom showing the applicationof the improved warp stop motion thereto; Fig. 2 is a rear elevation of the upper part of the detector bar actuating mechanism showing the detector bars and warp detectors; Fig. 3 is a sectional end elevation of the same; Fig. 1 is a top plan of a detail of the detector bar actuating mechanism; Fig. 5 is a top plan of the left hand end of the detector bars showing the relative position of thedetector bars and a warp detector after warp breakage; Fig. 6 is aside elevation of the same; and Fig. 7 is a detail of the knock-off lever.

The preferred embodiment of the inven tion is described, as follows :-The loom may be of any 'usual or preferred construction.

.It is shown as having a frame 10, a shipper tectors are provided with the usual slot 16.

Each row of detectors receives two detector former of which is supported in a fixed position, the latter being mounted to reciprocate alongside of the fixed bar. The detector bars are supported by the end castmgs 22 and 23, whichare provided with open slots to receive the detector bars. By reference to Fig. 5 a portion of the end casting 22 is shown .in plan and the fixed detector bar 20 is shown as held from movement by a pin 24 which engages the teeth on the bar. These end castings '22 and 23 teeth are formed at right angles to the length of the detector bars. One of the important features of the invention resides in this :-that when a detector falls and enters the interdental spaces in the fixed detector bar, the fallen detector bar is turned to an oblique position by the movement of the reciprocating member, thereby forcing the adjacent detectors apart and forming a conspicuous break in the row 'of detectors so as to afford the operative a clearly visible indication of the position of the fallen detector and convenient access to the broken warp for piercing. The construction and arrangement of the detector bars is such that when the conspicuous break in the row of detectors occurs by reason of a broken warp, this break is equal to sbstantially the width of the fallen drop wire or detector. This is well illustrated in Figs. 5 and 6 of the drawings.

The reciprocating detector bars are con- .nected together by means of a pin 30 carried on the lower ends of two depending arms 31 of the bell crank or detector bar operat overhanging. ears 34 which arise from the sides of the end piece 23. This pin 30 which connects the reciprocating detector bars is received in holes in the reciprocating detector bdrs and in slots in the fixed detector bars so that the movement of the pin 30 is back and forth in the slots 35 of the fixed detector bars. Ver 32 is provided with a horizontal arm 36 in) The bell crank leprovided with a pin 43 which is engaged beof the knock-off lever.

ivotally connected at its end'to the link 37 by which it is connected to the rear end of an eccentric or slip lever 38 pivoted at 39 to the loom frame. The forward end of this eccentric or slip lever 38 is reciprocated by end of this rod is provided with a slip connection to the lever 38 so that when the lever is arrested by the falling of a drop wire the connection will slip in the usual manner.

The forward end of the slip lever 38 is tween the'spring' lever 44 and the rod 42.,- This' spring lever is pivoted at one endto the rodv and-yieldingly pressed toward the rod to hold the pin against it by means of a spring 45. This spring lever hasa little depression in it which normally recelves the pin 43 so that in the stress incident to the normal operation of the device the pin is held in the depression between the spring lever and the rod. When the pin is arrested the spring yields and allows the pin to slide in either direction out of the notch. This slip connection is simple in form and has the advantage of being self-setting so that after the piecing up of a broken warp the operative has only to start the loom when the operation of the warp detector is resumed.

The connection between the warp detecting apparatus and the knock-off lever of the loom is described as follows :The shipper lever 11 is supported in the usual slot 47 in the bracket 48 extending from the side of the frame of the loom in the usual manner.

The knock-off lever 49 is pivotally supported on this bracket (as seen best in Fig. 7). The knock-off operating lever 50 pivotally supported at 51 upon the frame of the loom has itsupper end engaging the notch in the end To the knock-ofi operating lever 50 is pivotally attached the knock-off rod 53 which is provided with a notch 54 and adapted to be struck by a hunter pawl 55 pivotally mounted on the lay sword 12. When this bunter pawl engages the notch 54 it imparts a reciprocating movement to the knock-off rod which operates the knock-off operating lever which, in turn, swings the knockoff lever and knocks ofi the loom. The bunter pawl is prevented fromengaging the notch 54 in the knock-off rod at all times, except when the loom is to be stopped, by means of a pawl shield 56 pivotally mounted on the knock-off rod at 57, which has a portion which is moved into position to prevent the bunter pawl from engaging the notch 54 during the normal operation of'the loom. This pawl shield is connected by means of a link 59 with a T- running to the shaped rock lever 60, which is operated by the detector bar operating means in timed relation to the operation of thelay so that when the lay moves backward the shield will cover the notch at all times except when a drop wire has fallen. This T-shaped rock lever is pivotally mounted at 61 upon a boss projected forwardly from the end piece 23. This T-shaped rock lever 60 has two horizontal arms and one vertical arm, the end of which is connected by the link 59 to the pawl shield 56 hereinbefore referred to. The normal position of the lever is that of an inverted T. The lever is oscillated from the horizontal arm of the detector bar operating lever 32 which actuates-the reciprocating detectorrbars. To this end the horizontal arm 36 of the said lever is provided with a laterally extended bracket 63 carrying two fingers 64 and 65, one of which is adapted to engagethe underside of the forwardly extending arm 67 the otherof which is adapted to engage the upper sideof the rearwardly extending arm 68. Both fingers op-. erate to tip the T-shaped lever in a direction to cause a pull to be exerted upon the rod 59 pawl shield 56. The weight of the shield pulls the lever back to its normal position with the shield below the notch 54 in the knock-01f bar. Remembering that. the detector bars are oscillated by the main shaft 29 of the machine, which revolves once to two revolutions of the crankshaft 13, the necessity for actuating theshield twice for each revolution of the main shaft is apparent.

It is to be observed that the mechanism. for operating the shipper lever is extremely simple and directly actuated by the back stroke of the lay, at such times as a fallen detector shall arrest the reciprocating link 59, whereupon the detector bar actuated by the detector bar operating lever 32, being held from movement fails to lift the pawl shield, whereupon the hunter pawl engages the notch in the knock-off bar and knocks off the loom. This construction is an eflicient one for performing these operations. The slip connection between a detector bar actuating lever and the eccentric of the main shaft commends itself to the user by reason of its few and simple parts, its durability and its automatic re-settlng functions.

The present invention is not limited to the illustrated embodiment but it may be embodied in other forms within the scope of the claims.

What is claimed is 1. A warp stop motion for looms having, in combination, warp detectors, adetector bar, a detector bar operating lever having a bracket rigidl secured thereto provided with fingers, a s ipper, and connections between the shipper and the detector bar operating lever including a T-shaped lever en gauged by the fingers for controlling the actuation of the shipper.

2. A warp stop motion for looms having, in combination, warp detectors, a detector bar, a detector bar operating lever having a bracket provided With two fingers, a shipper, and connections between the shipper and the detector bar operating lever including a T- shaped leverfor controlling the actuation of the shipper, said shipper controlling lever 1e having provision whereby said fingers engage different sides of the cross piece of the T-shaped lever to move it in the same direction.

JOHN F. DUSTIN.

Witnesses:

J o'sErn SPENCER, JOHN Wnower. 

